The due date for filing Form 8955-SSA is the last day of the seventh month after the plan year ends. For a calendar-year plan, this date is July 31. The due date may be extended up to 2 ½ months by filing Form 5558, Application for Extension of Time To File Certain Employee Plan Returns, on or before the normal due date (not including any extensions), or by using an automatic extension of time to file Form 8955-SSA until the due date of the employer’s federal income tax return.
The IRS may from time to time announce special extensions of time under certain circumstances, such as extensions for presidentially declared disasters or for service in, or in support of, the Armed Forces of the United States in a combat zone. See IRS.gov for announcements of special extensions.